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Muscular adaptations and insulin‐like growth factor‐1 responses to resistance training are stretch‐mediated
Author(s) -
McMahon Gerard,
Morse Christopher I.,
Burden Adrian,
Winwood Keith,
Onambélé Gladys Leopoldine
Publication year - 2014
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.23884
Subject(s) - muscle architecture , medicine , resistance training , fascicle , insulin like growth factor , endocrinology , skeletal muscle , quadriceps muscle , anatomy , growth factor , receptor
: Modulation of muscle characteristics was attempted through altering muscle stretch during resistance training. We hypothesized that stretch would enhance muscle responses. Methods : Participants trained for 8 weeks, loading the quadriceps in a shortened (SL, 0–50° knee flexion; n = 10) or lengthened (LL, 40–90°; n = 11) position, followed by 4 weeks of detraining. Controls (CON; n = 10) were untrained. Quadriceps strength, vastus lateralis architecture, anatomical cross‐sectional area (aCSA), and serum insulin‐like growth factor‐1 (IGF‐1) were measured at weeks 0, 8, 10, and 12. Results : Increases in fascicle length (29 ± 4% vs. 14 ± 4%), distal aCSA (53 ± 12% vs. 18 ± 8%), strength (26 ± 6% vs. 7 ± 3%), and IGF‐1 (31 ± 6% vs. 7 ± 6%) were greater in LL compared with SL muscles ( P < 0.05). No changes occurred in CON. Detraining decrements in strength and aCSA were greater in SL than LL muscles ( P < 0.05). Conclusions : Enhanced muscle in vivo (and somewhat IGF‐1) adaptations to resistance training are concurrent with muscle stretch, which warrants its inclusion within training. Muscle Nerve 49 : 108–119, 2014